High score reward! How to make the background pure white without overexposure when taking pictures of goods?

Let me answer your question, although I don't think 20 points is a high score, hehe ~

You used a white background cloth when shooting goods, and the photos you took were overexposed. This is because the pure white background fooled the exposure meter inside the camera, just like when shooting a snow scene, the exposure meter inside the camera is always underexposed, so exposure compensation is needed. I looked at the chart you gave me. Actually, it's quite simple to take such a photo. You should continue to use your white background cloth, don't turn on the flash, and use central focus metering or even spot metering for goods. It's best not to use a flash, shoot along the light and shoot with a long focal length. If you want accuracy, you need to use a tripod. When using a digital camera, please use a custom white balance. Against your white background cloth, of course. One more thing, if it is not a special background cloth and is slightly transparent, it should be close to the white wall, otherwise the light coming in will affect the white balance. One more thing to remember, if you shoot with a digital camera, if there is a manual file M, try not to expose it in one file, so as to preserve the details and enhance the sharpness in post-processing.

These are some of my own experiences, which I hope will help you. Shooting still life is the basic skill of photography. If you try more, you can also use some skills such as manual lighting or multi-lamp (flash) wireless flashing. The advantage of figures is that they can be confirmed immediately, so that corresponding adjustments can be made continuously. If you use a small DC, be careful not to take pictures in night mode, which is easy to overexpose.

When measuring light, use double light to eliminate shadows, and use white seamless background cloth.